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/* See LICENSE file for copyright and license details. */
#include "common.h"
static size_t
hunk_head_part(const char *text, size_t len, size_t *first, size_t *last)
{
size_t off, r;
off = libpatch_get_zu__(&text[off], len - off, first);
if (!off)
return 0;
if (off < len && text[off] == ',') {
off += 1;
off += r = libpatch_get_zu__(&text[off], len - off, last);
if (!r)
return 0;
} else {
*last = *first;
}
return off;
}
int
libpatch_parse_normal_patch(const char *text, size_t textlen, size_t *textend,
struct libpatch_patch **patch, size_t *patchlen)
{
const char *patchtext = text;
size_t len = 0, size = 0, off, lineno1, lineno2, count1, count2, last;
int in_hunk = 0, need2, type, has_patch = 0;
char op;
*patch = NULL;
*patchlen = 0;
while ((len = libpatch_next_line__(&text, &textlen, len))) {
if (len >= 5 && !strncmp(text, "diff ", 5)) {
if (has_patch && textend)
break;
APPEND_STRING(5, LIBPATCH_PATCH_DIFF_LINE);
in_hunk = 0;
} else if (len >= 3 && in_hunk == 1 && need2 && !strncmp(text, "---", 3)) {
APPEND_OPTSTRING(3, LIBPATCH_PATCH_HUNK_FILE2);
in_hunk = 2;
} else if (len >= 3 && in_hunk == 0 && text[1] != ' ') {
off = hunk_head_part(&text[off], len - off, &lineno1, &last);
if (!off || 2 > len - off)
goto garbage;
if (!lineno1 && last)
goto garbage;
else if (!lineno1)
count1 = 0;
else if (last < lineno1)
goto garbage;
else
count1 = last - lineno1 + 1;
op = text[off++];
off = hunk_head_part(&text[off], len - off, &lineno2, &last);
if (!off || 2 > len - off)
goto garbage;
if (!lineno2 && last)
goto garbage;
else if (!lineno2)
count2 = 0;
else if (last < lineno2)
goto garbage;
else
count2 = last - lineno2 + 1;
if (op == 'a') {
in_hunk = 2;
} else if (op == 'c') {
in_hunk = 1;
need2 = 1;
} else if (op == 'd') {
in_hunk = 1;
need2 = 0;
} else {
goto garbage;
}
if (in_hunk == 1)
APPEND_OPTSTRING(off, LIBPATCH_PATCH_HUNK_FILE1);
else
APPEND_OPTSTRING(off, LIBPATCH_PATCH_HUNK);
has_patch = 1;
} else if (len >= 2 && in_hunk == 1 && !strncmp(text, "< ", 2)) {
type = LIBPATCH_PATCH_FILE1_ONLY;
file1_line:
APPEND_OPTSTRING(2, type);
if (!--count2)
in_hunk = 0;
(*patch)[*patchlen - 1].file1_lineno = lineno1++;
} else if (len >= 2 && in_hunk == 1 && !strncmp(text, " ", 2)) {
type = LIBPATCH_PATCH_FILE1_CONTEXT;
goto file1_line;
} else if (len >= 2 && in_hunk == 2 && !strncmp(text, "> ", 2)) {
type = LIBPATCH_PATCH_FILE2_ONLY;
file2_line:
APPEND_OPTSTRING(2, type);
if (!--count2)
in_hunk = 0;
(*patch)[*patchlen - 1].file2_lineno = lineno2++;
} else if (len >= 2 && in_hunk == 2 && !strncmp(text, " ", 2)) {
type = LIBPATCH_PATCH_FILE2_CONTEXT;
goto file2_line;
} else if (len >= 1 && !strncmp(text, "\\", 1) && *patchlen) {
if (IS_LINE((*patch)[*patchlen - 1].type) ||
!(*patch)[*patchlen - 1].lf_terminated)
goto garbage;
(*patch)[*patchlen - 1].lf_terminated = 0;
APPEND_NO_TEXT(LIBPATCH_PATCH_SYNTACTICAL);
} else {
garbage:
APPEND_STRING(0, LIBPATCH_PATCH_GARBAGE);
if (len == textlen)
(*patch)[*patchlen - 1].lf_terminated = 0;
}
}
if (textend)
*textend = (size_t)(text - patchtext);
return 0;
fail:
free(*patch);
*patch = NULL;
*patchlen = 0;
return -1;
}
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